class_docstr: Context manager to redirect stdout for exec_command test.
code: def __init__(self, stdout=None):
      self._stdout = stdout or sys.stdout
  
imports: import os
  import pytest
  import sys
  from tempfile import TemporaryFile
  from numpy.distutils import exec_command
  from numpy.distutils.exec_command import get_pythonexe
  from numpy.testing import tempdir, assert_, assert_warns, IS_WASM
  from io import StringIO
label_desc: Use image node_id 1 to create a new redirect_stdout object  with example: obj = redirect_stdout(stdout)